Thread-cutter.



Y J. CMMOONL THREAD CUTTER.-

APPLICATION man mum. I916.

mawwu Patented July 10, 1917.

2 SHEETS-SHEET I.

J. C. MOON.

THREAD CUTTER.

, APPLICATION FILED MAYIB, I916.

Patented. July 10, 1917.

2 SHEETS-SHEET 2 I f/W/WW J /1 6 New clarion.

JOHN C.' M OOI\T, ST. LOUIS, MISSOURI.

THREAD-GUTTER. I

' m mew re Patented July 11l,191'?.

f Application filed May is, 1916. semin eama To all whom it may concern:j Be it known that I, J OHN C. MooN, a citizen of the United States,residing at thecity of St. Louis, State of Missouri, have in vented acertain new and useful Improve. ment in Thread-Cutters, of which thefollowing is a full, clear, and exact description, such as will enableothers skilled in the art to which it apperta'ins' to make and use thesame, reference being had to the accompanying drawings, forming part ,ofthis specification, in which- Figure 1 is a sideelevational view of myimproved pipe threading machine.

' Fig. thereof.

Fig. 3 is a vertical sectional view through the device for clamping therod or pipe to be threaded.

Fig. 4 is a side elevational view partly in section of said clampingdevice.

This invention relates to a new and useful improvement in thread cuttersfor cutting threads upon theends of rods or pipes, the object bein toconstruct a machine of the character escribed which will simultaneouslycut threadson both ends of the rod afterward pointed out" in the claims.

' bench; or "table on which are mounted two'castings 2 forming bearingsfor shafts 3' which derive motion through 'themediu'm of pulleys 4 v orpipe. With these objects in view, my invention consists in theconstruction and arrangement and combination of the several parts, allof which will be described and In he drawings, 1'1nd1catesf -a" andbelts 5,,sa1dshafts being driven in opposite directions. The inner endof each shaft is made hollow and provided with a flange 3 (see Fig. 4)the face of which flange is provided with guides to receive radiallymovable cuttersor chasers 6. These cutters are held in position bysuitable bolts 7 and are slotted lengthwise so as to permit inward andoutward movement. Springs 8 are arranged in the slots with their innerends resting against bearing blocks which! are seated upon the bolts 7,the energies of said springs beingv directed at all times to move thecutters outwardly. The periphery of flange 3' is also provided withgrooves forming uide ways for longitudinally movable bloc (s 9, thelatter being provided with inclined or beveled outer ends which aredesigned to engage the inclined outer ends of the cutters 6, and forcethe same inwardly is a top plan view of a portion- 7 intoicutti11gposition. Blocks 9 are confined by the flangeof a sliding collar 10mounted on the inner end of'shaft 3, said sliding collar'beingkeyed tothe shaft so as to rotate therewith-and having an annular groove inwh1'ch fit the prongs of a bracket 11 (see Fig. 2), which bracket" is'slidingly mounted upon arod 12. The rod 12 is secured in suitable lugs2 on thecastings 2 and carries collars 13 adjustably mounted thereon.The purpose of the construction above described is asfollows:

When the shaft 3 is being retracted or moved outwardly, the parts are inthe full line position shown in Fig. 4. in which the cutters Goocupytheir outer position. The

continued outward movement of the shaft twill cause the yoke or bracket11 to contact withthe outermost collar 13, whereupon the collar 10 willhave a relative inward movement on shaft 3, causing the inclined outerthe thread will be cut thereon until the yoke or bracket 11 strikes theinnermost collar 13' when the'collar 10 will be moved relatively back.on shaft 3, permitting the cutters to open and thus enablin the quick,retractive movement of the sha t 3 and its carried arts.

The aiiove description applies tothe construction at each end of themachine, there being two cutters, one for operating on opposite ends ofthe same rod or pipe, and, as before stated, these cutters are, intendedto be rotated in opposite directions in order to properly cut thethreads.

, The. means for feeding the cutters inwardly and then retracting themconsists of operating handles 15 (see Fig. 1)- connected to a pinion 16mounted in fixed bearings, which pinion cooperates with racks 17 on theends of the oppositely extending rods 18. The outer ends of these rodsare connected to levers 19 pivoted in suitable brackets 20 secured tobed plates 1, the upper ends of levers 19 being pivotally connected tocollars 21 loosely mounted upon the shanks of llti yokes 22 which latterare pivoted to the ends of shafts 3. Jam nuts 23 hold these collars 21in position.- When the handles 15 are moved in a clockwise direction,the shafts 3 will be moved inwardly. When this cutting action iscompleted, the cutting jaws 6 will be moved outwardly and the handles 15can be quickly moved in a counter-clockwise direction so as to move theshafts 3 outwardly in readiness for another operation. The operator canof course feel the cutting action on the inward movement of the shaftand assist such action by pressure on handles 15 which pressure isnecessary in starting the cutting.

The means for holding the pipe or rod in position to be operated upon isbest shown in F igs. 3 and 4, wherein it will be observed that a bearingblock 25 is supported by a downward extension of the frame work whichsupports the table 1. This bearing block, or rather these two bearingblocks, as the mechanism for clamping the rods or pipes in position,about to be described, is duplicated for each end of the rods or pipes,provides a pivotal support for arms 26 extending through openings in thebed plate 1. 27 indicates a cam keyed to the shaft 28, on one end ofwhich shaft is arranged an operating handle 29. 30 indicate clampingblocks pivoted at 31 between the arms 26 and having rollers 32 at theirlower ends which cooperate with the cam 27. These clamping jaws arebifurcated at their lower ends between the prongs of which bifurcationssaid rollers 32 are mounted and in which bifurcations the cam 27operates, as shown in Fig. 3. Clamping jaws 30 are connected together attheir lower ends by means of springs 33 so that the rollers 32 are atall times in yielding engagement with the cam 27. The upper ends of theclampingjaws 30 are provided with semi-circular recesses 30 which aredesigned to register with correspondingly shaped recesses 26 formed inthe opposite side edges of a cross bar 26, which connects the upper endsof the arms 26. The pipe to be threaded is indicated at A. in Fig. 3,and the pipe being threaded, or in position to be threaded, is indicatedat B. in said figure. When the parts arein the position shown in Fig. 3,it will be observed that the clamping jaw at the left is open to receivethe pipe A. (or if said pipe had previously been threaded, to permit itsremoval, and the introduction of an unthreaded pipe in position), andthat the clamping jaw at the right is in clamping position holding thepipe B. against rotation, while it is being threaded. The cam 27 forcesthe clamping jaws into clamping positionand springs 33 open eithercompanion jaw when its companion is in clamping position.

Thus it will be seen that the clamping action of the jaws is positive,it being possible to exert considerable power on the clamping jawsthrough the cam, while the opening movement of the aws depends upon thespring action.

In order to determine the alinement of a pipe or rod with the cutters 6,there is a stop 26 on each side of one of the arms 26 which stopcotiperates with the brackets 34 mounted on the bed plate 1. Thesebrackets 34 may be adjustably mounted upon the bed plate 1 by slot andpin connections to enable their inward and outward adjustment, orremovable plates 35 may be arranged to coiiperate with the faces ofstops 26. This alinement of the pipe or rod to be threaded with thecutters 6 is quite important and the stops for arresting the arms 26 intheir extreme position must be accurately placed. The handle 29 servesas a means for rocking the arms 26 to and froand for this purpose it isonly necessary for the operator to pull the handle toward him or push itaway from him until the arms are arrested 'by their respective stops;then, by depressing or lifting the arm, as the case may be, the pipewhich has been threaded is released, and the pipe to be threaded isclamped in position. The released pipe may be removed and another pipeto be threaded placed in position in the jaws of the opened clamps. Itis immaterial whether the arms 26 are first rocked and the handle 29'then depressed or raised, or the handle first depressed or raised andthe arms 26 then rocked,this is optional with the operator and thesequence of operations is consequently left to his discretion.

The clamping jaws are duplicated for each end of the pipe, and in orderthat they may be moved in unison, the shaft 28 is extended from one sideof arms 26 to the other and, furthermore, said arms are connectedtogether by a bracket 36 (see Fig. 4) so'that they Will move in unison.

In order to position the pipes or rods to be threaded, I provide twostops 40 (see Fig. 2)

shafts toward or away from each other and stops for limiting thelengthwise movement in both directions of the cutter actuating meanscarried by each shaft whereby the continued movement of the shafteffects an 'inwa'rd or outward movement of said outends of which cuttersare inclined, a member carried by and movable longitudinally upon eachshaft, parts of which member are inclined and bear directly against theinclined outer ends of the cutters, manually operable means forsimultaneously moving both shafts toward or away from each other andstops for limiting the movement of the cutter actuating members upon theshafts in one direction so that the continued movement of the shaftswill effect an inward movement of the cutters, and yielding means formoving the cutters outwardly.

3. In a machine of the character described, the combination of a rockingarm, a pair of clamping jaws pivotally mounted thereon and cooperatingtherewith, and means for, rocking said arm, said means also controllingthe opening and closing movement of said clamping jaws.

4. In a machine .of the character described, the combination of arocking arm, stops for limiting its rocking movement in each direction,a pair of clamping jaws pivotally mounted on said arm and cooperatingtherewith to grip a pipe or rod to be operated upon, a cam forcontrolling the opening and closing movement ofsaid jaws, and means forholding said jaws in operative relation to said cam.

5. In a machine of the character described, the combination of a rockingarm, sto s for limiting its rocking movement in eac direction, apair ofclamping jaws pivotally mounted on said arm and coiiperating therewithto grip a pipe or rod to be op- T erated upon, a cam for controlling theopening and closing movement of said jaws, a handle for rocking said armand moving said cam and springs connected to said jaws whereby they areheld in yielding operative relation to said cam.

6. In a machine of. the class described, the combination with twopositively revolving shafts, of means for moving said shafts toward andaway from each other, cutters carried by said shafts, means forrendering said cutters effective or inefiective, and pipe gripping meansarranged between the inner ends of said shafts, which gripping means comprises a rocking arm, a pair of clamping jaws pivotally mounted thereonand 00- operating therewith, and means for rock ing said arm, whichmeans control the opening and closing movement of said clamping aws.

7. In a machine of the class described, the combination with a pair ofoppositely disposed thread cutters, of pipe'gripping means positionedbetween said cutters, which gripping means includes a rocking member, apair of clamping jaws pivotally mounted on said member and cooperatingtherewith to grip a pipe or rod to be threaded, and means for rockingsaid member, which means control the opening and closing movement of theclamping jaws.

In testimony whereof I hereunto afiix my signature in the presence oftwo Witnesses, this 15th day of May, 1916.

JOHN C. MOON.

Witnesses:

I M. P. SMITH,

M. A. HANDEL.

